My neighbours don't like us because when we moved in we had some renovations done in the house which caused noise and it annoyed them. The H is ok with us the W just ignores us 
Anyway H told us they were going away for 3 weeks two days ago. Sure enough they left. Yesterday I got a knock on the door asking if I'd take in a parcel for them. I said sure. He then told me it was big and pointed to it. It was huge. I have no idea what it was but looked the size of one of those massive TV boxes. I told him they were away
and I didn't want to take it. He said it was fine and he'd take it back.
My mum thinks I shouldn't have said they were away, which I probably shouldn't, and thinks maybe I should have taken in the parcel. But it was huge. I didn't want to store it for three weeks and if something did happen to it I probably would be liable for the cost? We're about to have more renovations started so don't have the space and don't really want to break a potentially expensive item accidentally.
Was I unreasonable?